Microsoft has a press announcement on the UN choosing ITPAC for its data center in Nairobi, Kenya.

Here is the specific part on the data center - ITPAC.

The ITPAC technology helps increase IT efficiency and reduces costs in a number of ways. It uses outside air for primary cooling, removing the need for mechanical cooling devices, and is based on a modular design that can be used to make the ITPAC modules easy to pre-manufacture, ship and install onsite. In this way, it dramatically reduces the typical datacenter carbon footprint and consumption of materials, such as water, concrete, steel, piping and copper, along with reducing additional carbon usage associated with the packaging and transporting of servers, equipment and supplies. It also provides a plug-and-play infrastructure to enable the rapid deployment and refresh of servers both today and in the future. In terms of efficiency, many traditional datacenters operate with a Power Usage Effectiveness (PUE) ratio of 2 or higher. Through thoughtful and efficient design, cooling strategies, and site selection, Microsoft has been able to reduce the PUE of its latest datacenters to operate in a range between 1.05 and 1.15. The eventual PUE range for UNEP will depend on the ambient weather conditions, computing capacity and IT services deployed.

Earth2Tech points out that the leading green data center companies - Google, Microsoft, and Yahoo will be at Green:NET 2011 where I'll be as well.

At Green:Net, Microsoft’s Environmental Strategist Rob Bernard will talk about the company’s green data center designs and its connected cities projects. We’ll also be featuring a discussion at Green:Net between Google’s Green Energy Czar Bill Weihl and Yahoo’s Director, Climate and Energy Strategy, Christina Page, about green data center tech, and Greenpeace will release new data on clean power and the cloud.